Fix compilation of test-hashmap.cc on Linux

test/cctest/test-hashmap.cc

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 62 matching lines @@
   uint32_t occupancy() const {
     uint32_t count = 0;
     for (HashMap::Entry* p = map_.Start(); p != NULL; p = map_.Next(p)) {
       count++;
     }
     CHECK_EQ(map_.occupancy(), static_cast<double>(count));
     return count;
   }
 
  private:
+  IntKeyHash hash_;
   HashMap map_;
-  IntKeyHash hash_;
 };
 
 
 static uint32_t Hash(uint32_t key)  { return 23; }
 static uint32_t CollisionHash(uint32_t key)  { return key & 0x3; }
 
 
 void TestSet(IntKeyHash hash, int size) {
   IntSet set(hash);
   CHECK_EQ(0, set.occupancy());
@@ skipping 72 matching lines @@
 
   }
   CHECK_EQ(0, set.occupancy());
 }
 
 
 TEST(Set) {
   TestSet(Hash, 1000);
   TestSet(CollisionHash, 100);
 }